I see them in the classifieds on YTmag.com all the time. There are also several old engine groups on the internet that could steer you in the right direction. Around here, farm auctions are a good place to find one - sometimes fairly cheap.
A forum community dedicated to all tractor owners and enthusiasts. Come join the discussion about farming, lawn maintenance, restoration, modifications, classifieds, troubleshooting, maintenance, and more!